Even he doesn't know what he was thinking! That's what the hero principal who tackled a gunman inside his high school is saying in his very first TV interview. He says his instincts kicked in and he jumped into action. The gunman has pleaded not guilty. And cops respond to a 911 call about a man with a gun in a suburban neighborhood. They arrive guns drawn and order the suspect on the ground. But it was actually a high school kid with a water gun! As Les Trent reports, it was all part of the popular "Senior Assassin" game. Plus, an American doctor is being hailed a hero today for jumping into action on the Hantavirus cruise ship. He was enjoying his vacation on board when the outbreak started. And when the ship's doctor got sick, his time off took a dramatic turn. Steven Fabian has our report. And it's a real life Disclosure Day. The Pentagon just released a trove of never-before-seen classified files on UFOs. So does it finally prove that we are not alone?